X Gzl
HAM Wholesale Card Club Catalog Dept. If all you want to do is get some output on 432 mt the procedure is simple buy an MA-4062 and build a trip er to multiply your 144 mc transmitter output. If the object is to play with or demonstrate the use of variable-reactance diodes in frequency multipliers or other applications, there are cheaper diodes that will do the job very f ig, h Experimenting with varactors. 'his circuit uses a common silicon power diode to double from 80 rn to 40 m. well, at...
L Vrf
Tan 45 Feb 90 M.ir 25 Milt 26 Mar 50 Mar 62 Apr 44 Apr 45 Apr 46 Apr 46 Apr 56 Apr 82 nl 52 id 62 ul 62 Aug 22 Au 26 Aug 26 Aug 41 Sep 44 Oct 90 Oct 111 Oct 113 Oct 116 Oct 117 Nov 30 Nov 32 Nov 40 Nov 104 Nov 104 Nov 105 106 Nov 108 Nov 109 Nov 121 Dec 92 Hix 98 , Dr lt 99 Construct ion Components, Workshop and Layout Tegboard panacea, K6UGT j , . Jan 27 Pr 'essjonal touch Feb 23 lost a piece of wire , K5BLF Feb 56 Printed circuits-almost, W3ITO . lt . . Mar 44 Kitchen heat sink, W0CGQ Jun 46...
Western Radio
EX .NEW 42 . KX 3,1 . EX 17 EX 35 . N KYY TS73S UPM11A h,Tf H gt Kmc with most accessories WE CO GS16741 K 5 Sysltm Computer Calibrator , Ball.intine 300 AV VTVM in ly inch linck Panel . Lambda 28 Elect. K iiUihii Luh Power Supply APR9 Control for switching TNI 28 J 29,130. T61A AXT2 TV Xmtr w Vidco amp tiyncMnilululurH RT82 APX6 makes 1215mc xceivr. See Oct-Nov CQ. . NEW 23 Alum. Cabinet, B7 Sloping pjmel Jtliove iluor be tow desk shelf. Castors. Rear door H0V60cy exbatist ran 75 UPM8 floats...
Info Lte
Fig. 2. W2EWL Cheap and Easy phasing exciter. Fig. 2. W2EWL Cheap and Easy phasing exciter. transmitter directly to twinlead you'd put an antennna tuner another block designed specifically for matching purposes at each end or interface in between to make everything work. Most of the circuits discussed so far are fairly compatible input and output requirements of each are described in the original discussions and wont be repeated here. A few just don't work out right without matching blocks...
K Rtj
Melvin Leibowifz W3KET Charles Poppas W3TND Wilmington, Delaware The authors recently completed an EICO 753, tri hand SSB-AM-CW transceiver kit. The kit sells for 179,95 and in our opinion it W worth every penny, Power input is 200 watts PEP on SSH and CW and 100 watts on AM, Full frequency coverage of the 80. 40 and 20 meter hands is provided, The receiver section has an offset tuning control so that it can he detuned a few kilocycles from the transmitted signal in case the other fellow drifts...
Broad Band Balun
Flat in the amateur bands from 3 to 30 Mcs, Full legal power Fully weather sealed Motches coax to antenna or balanced tme. Improves efficiency and radiation pattern. Two models, 1 to 1 or 4 to 1 impedance ratio Sire 1V4 00 x 4 long. Wt, 4 ox, FUGLE LABS 1835 Watchung Ave., Plainfield, N.J T20 4-5.3 mt ARC5 Transmitter S5.95 T21 5.3-7 mc ARC5 transmitter 5.95 MD7 ARCS plate modulator 5.95 Transformer HOY AC primary, 12VAC secondary, ARX-6 transponder less tubes 1212 mc 59,95 Navy beam filter...
K Esz
should connect an equalizing circuit such as that of Fig. 12 betwen the oscillator and the scope adjust for a clean pattern. To check for perfect linearity the most informative technique is to sample a little rf SSB ahead of the amplifier, and a little more after it, then compare the two samples. This is easily done with a scope and two linear detector units. Fig, 13 shows the circuits of the two detector units, while Fig. 14 shows the test setup in block-diagram form. Such a setup can be...
Plugin Ouncer
Hipermalloy ShieJd 0 17 shown slipping For over thirty years UTC engineering and production talent has pioneered the development of high quality transformers, inductors, electric wave filters, magamps and high Q coils. The UTC OUNCER series represented a break through in the reduction of size and weight. 0 series units are fully impregnated and sealed in drawn aluminum cases. Highest quality characteristics are inherent in the conservative design. With frequency response from 30 to 20,000...
V 1
generator, set to the mark and space frequency respectively. To simulate QSB on the air, the output ot each audio oscillator is made vari able, To simulate interference , each oscillator can be turned on continuously, i his feature makes the unit useful in SSB and AM transmitter modulation checks. The tones are very clean sinewaves, at over one volt out. And just so the unit does not collect dust after that perfect terminal unit is built, it can be changed to an AFSK simply by slaving the...
Waaa
Sensitive meter movements are the backbone of all accurate electronic measurements but their expense limits their use to all but the most costly instruments. If you have priced a 0-25 or 0-50 microampere meter in the past few years you know liv inexpensive meter amplifiers are useful. At one time sensitive meters could be obtained quite inexpensively on the surplus market, but nowadays even surplus meter prices are prohibitive. With transistors it is quite easy to build a meter amplifier that...
L 1
The bottom view shows the placement of the two meter converter over the rf chassis cut-out, RG-58A U is used to transfer signals to the band switch in the upper right comer, The bottom view shows the placement of the two meter converter over the rf chassis cut-out, RG-58A U is used to transfer signals to the band switch in the upper right comer, used for over a year with no decrease in performance. The converter with its power supply was bench tested as a module before securing it in place over...
Info Ptx
Simple DX antenna, W6WAW Sep 24 Siil antenna, W8ADV Sep 72 6-10 mobile whip, W3GSC Sep 94 coiix antenna. WSNOS , , . , . , Nov 2ft Fla. stvle tower, K4FQU , , Nov 88 Short 80 40 antenna Nov 109 Systematic antenna tuning Dee 102 3 in 1 birdcage, ZSSNZ Dec 110 AM, ham and transistors, Geisler . . h . . hm 12 Solid state noise clipper, KfiM H , . . , Ta-i 48 Controlled carrier pliite mod, W5EJIC Feb 68 Audio bandpass filter, Hansen . , Feb 70 SSB audio filter Feb 71 New power tube, W1KSZ Mar 36...
Phono Jack
Fig, 8 UHF untuned detector. CI con be 100 to 000 pf ing a small square of copper foil near and up it. Do this while watching an RF meter, such as the one described later in the article. LC and LB are spaced half an inch from the base plate and 5 16 inch from each other, Cl's ground connection is a half inch wide copper strap about inch long. The shortest possible leads were used on the transistor. use very small pliers to hold the leads close to the case and have had no trouble so far. The RF...
Info Gtf
and a det iled instruction book that tells you how to build an impedance matching module, an engine pulse counter, an audio amplifier and r probe, a multivibrator and an audio oscil a tor. The projects don't require etch ng, wiring or terminals. The instruction book contains diagrams, schematics, illustrations and parts list Theory and applications are also explained in detail Its only 1.95, Write Walt O DonnelL Vero Electronics, 48 Allen Blvd., Farmingdale, N.Y. We don t need to teli you much...
VFO Stability Part II
The article by W6BUV on VFO stability1 is excellent reading for anyone thinking about exploring tliis area of ham activity. Having been active in the RF oscillator field for almost 20 years, i wish to add a heart Amen ' Personal experience with vacuum tube oscillators gives Hie nod to the Clapp using a Telefunken 6AU6 or the Roblierson2 running at 2v dc on plates and heaters of a 12AU7 Telefunken and 12EC8 untuned buffer cathode follower. Each will hold frequency close to lx 0 5 with careful...
Knight Kit C Compressor
Hams have long known the advantages ol compression in the modulation dI a transmitter. You can look back at old handbooks and see the very complex and cumbersome equipment tliat used to be necessarv to add coma pression to a transmitter Then you can look at tlie neat, compact Knight C-577 and see how far we've come. This simple, easy-to-build compressor preamplifier connects between your microphone and transmitter mike input in a few minutes. Then it can be switched in and out of the circuit...
Texas
FOR OUR SPRING BARGAIN CATALOG ON Semiconductors Poly Paks JTl1 Paris I1 H R M3 send riieck, money I r r gt iYii r, im lt3de pnstftiro ave. wt. I J W rep link 1 Ih. Ratetin not i30 iiays. fc fca 1 ci D PAK KING OF THE WORLD Oscar III orbit computor, W7SMC Mar 20 Scope pix trix, K6UGT Mar 48 Trans form ex noise Jul 62 Parallel resistors, WA2BWQ Aug 76 Clean that bug Dec 109 Conalrad Not EES Yes K3RXK Ian 38 Ham and CD, W5CZ Feb 58 Improved halo mount, K3JZH Mar 84 2 kw mobile, W2DMK Oct 6 Bumper...
Info Gpk
cast stations use compressors I'm sure none use clippers, Oi course, hams don't want high fidelity in frequenc response, but we do want low harmonic md intermodulation distortioit so that our signals an clean and pleasant to listen to. Clippers are notorious for harmonic distortion that's whv thev have to be followed by filters. he distortion that a compressor introduces is mostly a matter of phase and amplitude, which is not unpleasant, I connected the C-577 to a 50 watt 6 meter AM...
Rtty
Corrections in errorless RTTY converter, K5JKX . . Feb 72 Garden City TU. W7CJB . Mar 16 Novel AFSK oscillator, K8ERV Apr 66 Toroid letter May 99, Jun 18 FSK VFO, W6TKA Tun 18 Scope monitor Aug 12 Pattern distortion Aug 43 Teletype tester . , . Aug 60 Twin City TU improvement Nov 104 Parametric-xistor multipliers, W6 UD RF power amp, design, WA2DfO . . Simplified solid state, WA2INM Switching with d xles. K1SDX Are 20 tf xistors coining W7SMC . . Transistors for hams. WA6BSO . - . . Tan 12 an...
Wainm
The transceiver as built in the Gold Plated Test Oscillator cabinet, Using a neater cabinet is permissible. The transceiver as built in the Gold Plated Test Oscillator cabinet, Using a neater cabinet is permissible. In the Gorges of Dodes. Left to right, CN8BS, Mrs Peycelon cooking the picnic, CN8BC and Mr, Pey-eel ont In the Gorges of Dodes. Left to right, CN8BS, Mrs Peycelon cooking the picnic, CN8BC and Mr, Pey-eel ont Ei M. Wogner G3B1D 5, Ferncroft Ave. London, NW3, England 'here are many...
Info Ypn
Roughly, these are our rates. You would do very well, if you are interested in advertising, to get our official rotes and all of the details. You'll never get rich selling to boms, but you won't be quite as poor if you advertise in 73. 73 Magazine is publiihed monthly thank heavens it's not weekly by 73, Ine,, Peterborough, N. H. Zip 03458 terrible number . The phone is 603-924 OS7 J. Subscription rates 54.00 per year, 7.00 two yean, S10 tbree years world wide. Second class postage is paid at...
of Old Receivers
There are a number of commercial ham band or general coverage receivers and military surplus receivers which cover the 6 meter band, W hile some are hotter than others, practically none of these yield performance bare-loot as good as that obtainable with a preamplifier or converter using a low noise rf tube. While a preamp is not too expensive, it is a nuisance when ch mging bands, and in many locations the additional gain is an embarrassment rather than an improvement because it intensifies...
Tucker Tin Ssb Transmitter
signal is sampled and used for automatic gain control, to prevent limiting in the linear amps. This exciter is a filter type, and has been highly popular with those likiog filter exciters. One of equal popularity among the phasing set was W2EW L s Cheap and Easy SSB ' originally described in QST for March, 1956, The block diagram of this unit appears in Fig. 2 the schematic is in the ARRL publication mentioned earlier. Like the W61 luV rig, this uses a conventional audio pre-amp without about...
Info Evu
VHF tank circuit design, YV6GCY Add on neutralization, Kit XL . . lantern I a for UHF, KOMIO UHF signal generator, K6M1 . . Spare that meter, W8BPY . IIF-UHF sig. generator, K1CLL Versatile scope, W0OPA IJt gt wer decade resistor, Lyman - Improve GOO, K5JKX . , Imaginoniiig with meters, W8BPY Noise figure measurements, K5JKX DC dummy load, Lyman Cheap SWR bridge, W1JJ1 UHF signal source, klCLL Light bulb dummy loads, WttOUR funk box PWR-SWR meter, K4QYC RF measurements, K5JKX . Audio frequency...
I 1
I Q Second-Class Radiotelephone License Handbook. New 3rd edition complete study course for elements I, II and I I of the latest FCC exams. Helps you earn the license you need for communications and two-way radio work. Order QAN-2, only , 3.95 First-Class Radiotelephone License Handbook. By Ed- word A , Noli, Completely Revised and Updated. Contains questions and answers based on Klement IV of the KCC exam all the information you need to qualify To a 1st Class License Also provides the...